This rollout is available from the Display panel. The buttons let you freeze or unfreeze individual objects by selecting them, regardless of their category.
Frozen objects remain on the screen, but can’t be selected, transformed, or modifed. Frozen objects turn dark grey. Frozen lights and cameras, and their associated viewports, continue to work as they normally do.
Freeze Selected: Freezes the selected object(s).
Freeze Unselected: Freezes all visible objects except the selected ones. Use this to quickly freeze all the objects except the one you're working on.
Freeze By Name: Lets you select the objects to freeze by name.
Freeze By Hit: Causes any object you click in the viewport to be frozen. If you hold the CTRL key while selecting an object, that object and all of its children are frozen. To exit Freeze by Hit mode, right-click, press Escape, or select a different function. This mode is automatically turned off if you freeze all objects in the scene.
Unfreeze All: Unfreezes all frozen objects.
Unfreeze By Name: Displays a dialog in which you can unfreeze objects you select from a list.
Unfreeze By Hit: Causes any object you click in the viewport to be unfrozen. If you hold the CTRL key while selecting an object, that object and all of its children are unfrozen.